Third European Summer Scholl on Language, Logic, and Information - Saarbrücken 1991. - Frieder Stolzenburg; Alexander Bach; Christian Lieske; Hanno Ridder; Martin Volk 001 (Künstliche Intell., 1992)

GTU - eine Grammatik Testumgebung mit Testsatzarchiv. - Martin Volk 001; Hanno Ridder (LDV Forum, 1992)

Liveness in Bounded Petri Nets Which Are Covered by T-Invariants. - Kurt Lautenbach; Hanno Ridder (Application and Theory of Petri Nets, 1994)

Analyse von Petri-Netz-Modellen mit Entscheidungsdiagrammen. - Hanno Ridder (Fölbach, 1997)